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## Description This adds `AppLifecycleListener`, a class for listening to changes in the application lifecycle, and responding to requests to exit the application. It depends on changes in the Engine that add new lifecycle states: https://github.com/flutter/engine/pull/42418 Here's a diagram for the lifecycle states. I'll add a similar diagram to the documentation for these classes.  ## Related Issues - https://github.com/flutter/flutter/issues/30735 ## Tests - Added tests for new lifecycle value, as well as for the `AppLifecycleListener` itself.
47 lines
1.8 KiB
Dart
47 lines
1.8 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/services.dart';
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import 'package:flutter/widgets.dart';
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import 'package:flutter_api_samples/widgets/binding/widget_binding_observer.0.dart'
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as example;
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import 'package:flutter_test/flutter_test.dart';
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void main() {
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testWidgets('App tracks lifecycle states', (WidgetTester tester) async {
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Future<void> setAppLifeCycleState(AppLifecycleState state) async {
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final ByteData? message =
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const StringCodec().encodeMessage(state.toString());
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await tester.binding.defaultBinaryMessenger.handlePlatformMessage(
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'flutter/lifecycle', message, (_) {});
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}
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await tester.pumpWidget(
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const example.WidgetBindingObserverExampleApp(),
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);
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expect(find.text('There are no AppLifecycleStates to show.'), findsOneWidget);
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await setAppLifeCycleState(AppLifecycleState.resumed);
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await tester.pumpAndSettle();
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expect(find.text('state is: AppLifecycleState.resumed'), findsOneWidget);
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await setAppLifeCycleState(AppLifecycleState.inactive);
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await tester.pumpAndSettle();
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expect(find.text('state is: AppLifecycleState.inactive'), findsOneWidget);
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await setAppLifeCycleState(AppLifecycleState.paused);
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await tester.pumpAndSettle();
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// Can't look for paused text here because rendering is paused.
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await setAppLifeCycleState(AppLifecycleState.inactive);
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await tester.pumpAndSettle();
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expect(find.text('state is: AppLifecycleState.inactive'), findsNWidgets(2));
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await setAppLifeCycleState(AppLifecycleState.resumed);
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await tester.pumpAndSettle();
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expect(find.text('state is: AppLifecycleState.resumed'), findsNWidgets(2));
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});
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}
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